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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb9caa7e20078defc1128219655e0f431553909c8ce599fafb679ceb5ef5120' 
  AND token = 'CX8/utcMkGxpnOlHDk6SW9e9/kCSN9SYGuicdKFU9BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}